Re: kern/45718: processes sometimes get stuck and spin in vm_map

[David Holland <dholland-bugs%netbsd.org@localhost>]

The following reply was made to PR kern/45718; it has been noted by GNATS.

From: David Holland <dholland-bugs%netbsd.org@localhost>
To: gnats-bugs%NetBSD.org@localhost
Cc: 
Subject: Re: kern/45718: processes sometimes get stuck and spin in vm_map
Date: Sun, 2 Sep 2012 03:45:14 +0000

 On Sun, Sep 02, 2012 at 12:50:04AM +0000, Chuck Silvers wrote:
  >  On Sat, Sep 01, 2012 at 07:20:05PM +0000, Jonathan A. Kollasch wrote:
  >  >  I've been seeing the hangs of the exec_pool_alloc() variety in 6.0RC1 on
  >  >  i386.  Using  dd if=/dev/zero of=/dev/null count=1 bs=1G  (machine has
  >  >  about 2G of RAM, sometimes needs to be more than 1G though) tends to
  >  >  unwedge everything that gets stuck in vm_map wait channel here.
  >  
  >  this sounds like KVA exhaustion.  this was a problem on i386 some years ago
  >  and I don't remember whether it was ever really fixed.  I vaguely recall
  >  there was a particular PR that was the main means of tracking that issue
  >  but I can't find it now.
 
 Do you remember anything else about that PR? I can't find it from
 obvious keywords. Is it likely to have been closed?
 
 -- 
 David A. Holland
 dholland%netbsd.org@localhost